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In Bacillus subtilis cells, we identified a new partner of HPr, an enzyme of the glycolysis pathway, the glyceraldehyde-3-phosphate dehydrogenase GapA. We showed that, in vitro, phosphorylated and unphosphorylated forms of HPr and its homologue, Crh, could interact with GapA, but only their seryl-phosphorylated forms were able to inhibit its activity.
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Pompeo et al. (2006) studied this question.
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